Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Manual — part 1351
6A–8
ENGINE MECHANICAL (6VD1 3.2L)
Hesitation
Condition
Possible cause
Correction
Hesitation on acceleration
Throttle Position Sensor adjustment
incorrect
Replace throttle valve assembly
Throttle Position Sensor circuit open
or shorted
Correct or replace
Mass Airflow Sensor circuit open or
poor connections
Correct or replace
Mass Airflow Sensor defective
Replace
Manifold Absolute Pressure (MAP)
Sensor circuit open or shorted
Correct or replace
MAP Sensor defective
Replace
Intake Air Temperature (IAT) Sensor
circuit open or poor connections
Correct or replace
Ion Sensing Module circuit open or
poor connections
Correct or replace
Ion Sensing Module defective
Replace
IAT Sensor defective
Replace
Hesitation at high speeds
Fuel tank strainer clogged
Clean or replace
(Fuel pressure too low)
Fuel pipe clogged
Clean or replace
Fuel filter clogged
Replace
Defective fuel pump system
Check and replace
Fuel Pressure Control Valve leaking
Replace
Hesitation at high speeds
(Fuel injector not working normally)
Power supply or ground circuit for
Multiport Fuel Injection System
shorted or open
Check and correct or replace
Fuel Injector defective
Replace
Cable of Multiport Fuel Injection
System circuit open or poor
connections
Correct or replace
6A–9
ENGINE MECHANICAL (6VD1 3.2L)
Condition
Correction
Possible cause
Hesitation at high speeds
Powertrain Control Module defective
Replace
Throttle Position Sensor cable
broken or poor connections
Correct or replace
Throttle Position Sensor defective
Replace
Engine Coolant Temperature Sensor
circuit open or shorted
Correct or replace
Engine Coolant Temperature Sensor
defective
Replace
Mass Airflow Sensor circuit open or
poor connections
Correct or replace
Mass Airflow Sensor defective
Replace
MAP Sensor cable broken or poor
connections
Correct or replace
MAP Sensor defective
Replace
IAT Sensor circuit open or poor
connections
Correct or replace
IAT Sensor defective
Replace
Ion Sensing Module circuit open or
poor connections
Correct or replace
Ion Sensing Module defective
Replace
Throttle valve not fully opened
Check and correct or replace
Air Cleaner Filter clogged
Replace filter element
Power supply voltage too low
Check and correct or replace
6A–10
ENGINE MECHANICAL (6VD1 3.2L)
Engine Lacks Power
Condition
Possible cause
Correction
Trouble in fuel system
Fuel Pressure Control Valve not
working normally
Replace
Fuel injector clogged
Clean or replace
Fuel pipe clogged
Clean
Fuel filter clogged or fouled
Replace
Fuel pump drive circuit not working
normally
Correct or replace
Fuel tank not sufficiently breathing
due to clogged Evaporative
Emission Control System circuit
Clean or replace
Water in fuel system
Clean
Inferior quality fuel in fuel system
Use fuel of specified octane rating
Powertrain Control Module supplied
poor voltage
Correct circuit
Throttle Position Sensor cable
broken or poor connections
Correct or replace
Throttle Position Sensor defective
Replace
Mass Airflow Sensor not working
normally
Replace
Manifold Absolute Pressure Sensor
not working normally
Replace
Intake Air Temperature Sensor not
working normally
Replace
Engine Coolant Temperature Sensor
circuit open or shorted
Correct or replace
Engine Coolant Temperature Sensor
defective
Replace
Powertrain Control Module defective
Replace
Trouble in intake or exhaust system
Air Cleaner Filter clogged
Replace filter element
Air duct kinked or flattened
Correct or replace
TWC defective
Repair
Ignition failure
————
Refer to Hard Start Troubleshooting
Guide
Heat range of spark plug inadequate
Install spark plugs of adequate heat
range
Ignition coil defective
Replace
6A–11
ENGINE MECHANICAL (6VD1 3.2L)
Condition
Correction
Possible cause
Engine overheating
Level of Engine Coolant too low
Replenish
Fan clutch defective
Replace
Incorrect fan installed
Replace
Thermostat defective
Replace
Engine Coolant pump defective
Correct or replace
Radiator clogged
Clean or replace
Radiator filler cap defective
Replace
Level of oil in engine crankcase too
low or wrong engine oil
Change or replenish
Resistance in exhaust system
increased
Clean exhaust system or replace
defective parts
Throttle Position Sensor adjustment
incorrect
Replace with Throttle Valve ASM
Throttle Position Sensor circuit open
or shorted
Correct or replace
Cylinder head gasket damaged
Replace
Engine overcooling
Thermostat defective
Replace (Use a thermostat set to
open at 82
°
C (180
°
F))
Engine lacks compression
————
Refer to Hard Start
Others
Tire inflation pressure abnormal
Adjust to recommended pressures
Brake drag
Adjust
Clutch slipping
Adjust or replace
Level of oil in engine crankcase too
high
Correct level of engine oil
Exhaust Gas Recirculation Valve
defective
Replace
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